Physics
Which statement best describes an igneous intrusion?

Magma is injected into surrounding rock forming an igneous intrusive
Igneous intrusion for when ice crystals splash into lava
Magma explodes to the surface and forms a smooth outer layer of rock
Magma is exported to an open area and forms iron

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
None of above

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Refraction of sunlight

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